@article{macgrath1997digital, title = {Digital Power Amplification Using Sigma-Delta Modulation and Bit Flipping}, author = {Macgrath, Anthony J. and Sandler, Mark B.}, journal = {J. Audio Eng. Soc}, volume = {45}, number = {6}, pages = {476--487}, year = {1997}, url = {https://www.aes.org/e-lib/browse.cfm?elib=7851} }